Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor
Sentinel-5 (S5) and its precursor (S5P) are future European satellite missions aiming at global monitoring of methane (CH<sub>4</sub>) column-average dry air mole fractions (XCH<sub>4</sub>). The spectrometers to be deployed onboard the satellites record spect...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-09-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/8/3617/2015/amt-8-3617-2015.pdf |
| _version_ | 1818957003207213056 |
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| author | R. Checa-Garcia J. Landgraf A. Galli F. Hase V. A. Velazco H. Tran V. Boudon F. Alkemade A. Butz |
| author_facet | R. Checa-Garcia J. Landgraf A. Galli F. Hase V. A. Velazco H. Tran V. Boudon F. Alkemade A. Butz |
| author_sort | R. Checa-Garcia |
| collection | DOAJ |
| description | Sentinel-5 (S5) and its precursor (S5P) are future European
satellite missions aiming at global monitoring of methane
(CH<sub>4</sub>) column-average dry air mole fractions
(XCH<sub>4</sub>). The spectrometers to be deployed onboard the
satellites record spectra of sunlight backscattered from the Earth's
surface and atmosphere. In particular, they exploit CH<sub>4</sub>
absorption in the shortwave infrared spectral range around
1.65 μm (S5 only) and 2.35 μm (both S5 and
S5P) wavelength. Given an accuracy goal of better than 2 % for
XCH<sub>4</sub> to be delivered on regional scales, assessment and
reduction of potential sources of systematic error such as
spectroscopic uncertainties is crucial. Here, we investigate how
spectroscopic errors propagate into retrieval errors on the global
scale. To this end, absorption spectra of a ground-based Fourier
transform spectrometer (FTS) operating at very high spectral
resolution serve as estimate for the quality of the spectroscopic
parameters. Feeding the FTS fitting residuals as a perturbation into
a global ensemble of simulated S5- and S5P-like spectra at relatively
low spectral resolution, XCH<sub>4</sub> retrieval errors exceed
0.6 % in large parts of the world and show systematic correlations
on regional scales, calling for improved spectroscopic parameters. |
| first_indexed | 2024-12-20T11:02:56Z |
| format | Article |
| id | doaj.art-b08bb3ffad104e5cbe6e9a91c4c05e07 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-20T11:02:56Z |
| publishDate | 2015-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-b08bb3ffad104e5cbe6e9a91c4c05e072022-12-21T19:42:57ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482015-09-01893617362910.5194/amt-8-3617-2015Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursorR. Checa-Garcia0J. Landgraf1A. Galli2F. Hase3V. A. Velazco4H. Tran5V. Boudon6F. Alkemade7A. Butz8IMK-ASF, Karlsruhe Institute of Technology (KIT), Karlsruhe, GermanyNetherlands Institute for Space Research (SRON), Utrecht, the NetherlandsSpace Research and Planetary Sciences, Physics Institute, University of Bern, Bern, SwitzerlandIMK-ASF, Karlsruhe Institute of Technology (KIT), Karlsruhe, GermanyCenter for Atmospheric Chemistry, Faculty of Science, Medicine & Health, University of Wollongong, Wollongong, AustraliaLaboratoire Interuniversitaire des Systèmes Atmosphériques, CNRS-UMR 7583, Université Paris Est Créteil, Université Paris Diderot, Institut Pierre-Simon Laplace, FranceLaboratoire Interdisciplinaire Carnot de Bourgogne, UMR6303 CNRS-Univ. Bourgogne Franche-Comté, 9 Av. A. Savary, BP 47870, Dijon, FranceNetherlands Institute for Space Research (SRON), Utrecht, the NetherlandsIMK-ASF, Karlsruhe Institute of Technology (KIT), Karlsruhe, GermanySentinel-5 (S5) and its precursor (S5P) are future European satellite missions aiming at global monitoring of methane (CH<sub>4</sub>) column-average dry air mole fractions (XCH<sub>4</sub>). The spectrometers to be deployed onboard the satellites record spectra of sunlight backscattered from the Earth's surface and atmosphere. In particular, they exploit CH<sub>4</sub> absorption in the shortwave infrared spectral range around 1.65 μm (S5 only) and 2.35 μm (both S5 and S5P) wavelength. Given an accuracy goal of better than 2 % for XCH<sub>4</sub> to be delivered on regional scales, assessment and reduction of potential sources of systematic error such as spectroscopic uncertainties is crucial. Here, we investigate how spectroscopic errors propagate into retrieval errors on the global scale. To this end, absorption spectra of a ground-based Fourier transform spectrometer (FTS) operating at very high spectral resolution serve as estimate for the quality of the spectroscopic parameters. Feeding the FTS fitting residuals as a perturbation into a global ensemble of simulated S5- and S5P-like spectra at relatively low spectral resolution, XCH<sub>4</sub> retrieval errors exceed 0.6 % in large parts of the world and show systematic correlations on regional scales, calling for improved spectroscopic parameters.http://www.atmos-meas-tech.net/8/3617/2015/amt-8-3617-2015.pdf |
| spellingShingle | R. Checa-Garcia J. Landgraf A. Galli F. Hase V. A. Velazco H. Tran V. Boudon F. Alkemade A. Butz Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor Atmospheric Measurement Techniques |
| title | Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor |
| title_full | Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor |
| title_fullStr | Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor |
| title_full_unstemmed | Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor |
| title_short | Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor |
| title_sort | mapping spectroscopic uncertainties into prospective methane retrieval errors from sentinel 5 and its precursor |
| url | http://www.atmos-meas-tech.net/8/3617/2015/amt-8-3617-2015.pdf |
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